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Chapter 16 Data binding 438 However, this program still needs a code-behind file to manage applying the italic and boldface at-tributes to the block of text. These methods are identical to those in the early CheckBoxDemo pro-gram:public partial class NewCheckBoxDemoPage : ContentPage{ public NewCheckBoxDemoPage() { // Ensure link to Toolkit library. new Xamarin.FormsBook.Toolkit.NewCheckBox(); InitializeComponent(); } void OnItalicCheckBoxChanged(object sender, bool isChecked) { if (isChecked) { label.FontAttributes |= FontAttributes.Italic; } else { label.FontAttributes &= ~FontAttributes.Italic; } } void OnBoldCheckBoxChanged(object sender, bool isChecked) { if (isChecked) { label.FontAttributes |= FontAttributes.Bold; } else { label.FontAttributes &= ~FontAttributes.Bold; } }} Xamarin.Forms does not support a “multi-binding” that might allow multiple binding sources to becombined to change a single binding target. Bindings can do a lot, but without some additional codesupport, they can’t do everything. There’s still a role for code.

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